Polyfill for the Prompt API (`LanguageModel`) backed by Firebase AI Logic, Gemini API, OpenAI API, or Transformers.js.
A native "Headers" class polyfill.
Polyfill for the URLPattern API
A polyfill for the internal diagnostics_channel module
Bare minimum fetch polyfill in 500 bytes
A robust & optimized `String.prototype.includes` polyfill, based on the ECMAScript 6 specification.
A lightweight polyfill library for Promise-based WebExtension APIs in Chrome.
Web Streams, based on the WHATWG spec reference implementation
Babel helper to create your own polyfill provider
ECMAScript 6 Symbol polyfill
Fast polyfill for TextEncoder and TextDecoder, only supports utf-8
A Babel plugin to inject imports to regenerator-runtime
Fork of eventsource package - W3C compliant EventSource client for Node.js and browser (polyfill)
A Babel plugin to inject imports to core-js@2 polyfills
An EventTarget Polyfill
Lightweight promise polyfill. A+ compliant
A lightweight polyfill for Temporal, successor to the JavaScript Date object
Polyfill Node.js core modules in Webpack.
Universal WHATWG Fetch API for Node, Browsers and React Native
Polyfill/ponyfill for the AbortController DOM API + optional patching of fetch (stub that calls catch, doesn't actually abort request).
A structuredClone polyfill
A polyfill for the Resize Observer API
Polyfill for Temporal (https://github.com/tc39/proposal-temporal), an ECMA TC39 Stage 3 proposal
A Babel plugin to inject imports to core-js@3 polyfills